How to debug an apache virtual host configuration?

Question

Once again, I have a problem with my apache virtual host configuration. (The default configuration is used instead of my specific one).

The problem is not really the

Answer 1

I found my own mistake, I did not add log file name: ErrorLog /var/log/apache2
And this path: Directory "/usr/share/doc/" Did not contain website sources.

After I changed these two, all worked. Interestingly, apache did not issue any errors, just did not open my website silently on my Mac OS Sierra.